:root {
    --primary-color: #1E3A8A;
    --accent-color: #3B82F6;
    --sidebar-bg: #0F172A;
    --light-bg: #F8FAFC;
    --white: #FFFFFF;
    --text-dark: #1F2937;
    --text-light: #6B7280;
    --border-color: #E5E7EB;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: #3B82F6;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-dark);
    line-height: 1.5;
}

/* Layout */
.layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--sidebar-bg);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    padding: 20px 0;
    z-index: 1000;
}

.sidebar-logo {
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 20px;
    font-size: 20px;
    font-weight: bold;
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background-color: rgba(59, 130, 246, 0.1);
    color: white;
    border-left-color: var(--accent-color);
}

.sidebar-nav svg {
    width: 20px;
    height: 20px;
}

/* Main Content */
.main-content {
    margin-left: 280px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Topbar */
.topbar {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.logout-btn {
    background-color: var(--danger);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s ease;
}

.logout-btn:hover {
    background-color: #DC2626;
}

/* Content Area */
.content {
    padding: 30px;
    flex: 1;
}

/* Flash Messages */
.flash-messages {
    margin-bottom: 20px;
}

.alert {
    padding: 12px 20px;
    border-radius: 6px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background-color: #D1FAE5;
    color: #065F46;
    border-left: 4px solid var(--success);
}

.alert-error {
    background-color: #FEE2E2;
    color: #7F1D1D;
    border-left: 4px solid var(--danger);
}

.alert-warning {
    background-color: #FEF3C7;
    color: #92400E;
    border-left: 4px solid var(--warning);
}

.alert-info {
    background-color: #DBEAFE;
    color: #0C2340;
    border-left: 4px solid var(--info);
}

.alert-close {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: 20px;
    line-height: 1;
}

/* Cards */
.card {
    background-color: var(--white);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 24px;
    margin-bottom: 20px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
    margin: 0;
}

.card-subtitle {
    font-size: 14px;
    color: var(--text-light);
    margin: 5px 0 0 0;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #1E40AF;
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
    background-color: var(--accent-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #2563EB;
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-success {
    background-color: var(--success);
    color: white;
}

.btn-success:hover {
    background-color: #059669;
}

.btn-danger {
    background-color: var(--danger);
    color: white;
}

.btn-danger:hover {
    background-color: #DC2626;
}

.btn-light {
    background-color: var(--light-bg);
    color: var(--text-dark);
    border: 1px solid var(--border-color);
}

.btn-light:hover {
    background-color: #E5E7EB;
}

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control:disabled {
    background-color: var(--light-bg);
    color: var(--text-light);
    cursor: not-allowed;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.form-row.full {
    grid-template-columns: 1fr;
}

.checkbox-group,
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-check input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-check label {
    margin: 0;
    cursor: pointer;
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin-bottom: 20px;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.table thead {
    background-color: var(--primary-color);
    color: white;
}

.table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

.table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

.table tbody tr:nth-child(odd) {
    background-color: var(--light-bg);
}

.table tbody tr:hover {
    background-color: #E0E7FF;
}

.table-actions {
    display: flex;
    gap: 8px;
}

.table-actions a,
.table-actions button {
    padding: 6px 10px;
    font-size: 12px;
}

/* Badge */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background-color: #D1FAE5;
    color: #065F46;
}

.badge-danger {
    background-color: #FEE2E2;
    color: #7F1D1D;
}

.badge-warning {
    background-color: #FEF3C7;
    color: #92400E;
}

.badge-info {
    background-color: #DBEAFE;
    color: #0C2340;
}

.badge-secondary {
    background-color: #F3F4F6;
    color: #374151;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--white);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border-left: 4px solid var(--accent-color);
}

.stat-value {
    font-size: 32px;
    font-weight: bold;
    color: var(--primary-color);
    margin: 10px 0;
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
}

/* Filter Bar */
.filter-bar {
    background-color: var(--white);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.filter-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-dark);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.filter-group select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
}

/* Login Page */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
}

.login-card {
    background-color: var(--white);
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.login-logo {
    text-align: center;
    margin-bottom: 30px;
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-color);
}

.login-form .form-group {
    margin-bottom: 20px;
}

.login-btn {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    font-weight: 600;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 250px;
        margin-left: -250px;
        transition: margin-left 0.3s ease;
    }

    .sidebar.active {
        margin-left: 0;
    }

    .main-content {
        margin-left: 0;
    }

    .content {
        padding: 20px;
    }

    .topbar {
        padding: 15px 20px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .table {
        font-size: 12px;
    }

    .table th,
    .table td {
        padding: 8px;
    }

    .filter-bar {
        flex-direction: column;
    }

    .login-card {
        margin: 20px;
    }
}

/* Utilities */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mb-0 {
    margin-bottom: 0;
}

.mb-1 {
    margin-bottom: 10px;
}

.mb-2 {
    margin-bottom: 20px;
}

.mt-1 {
    margin-top: 10px;
}

.mt-2 {
    margin-top: 20px;
}

.mt-3 {
    margin-top: 30px;
}

.d-none {
    display: none;
}

.d-block {
    display: block;
}

.d-flex {
    display: flex;
}

.gap-1 {
    gap: 10px;
}

.gap-2 {
    gap: 20px;
}

.w-100 {
    width: 100%;
}

.opacity-50 {
    opacity: 0.5;
}